SQL Server操作实例

创建数据库

create database accountInfo/*创建账户信息数据库*/

创建数据表

 /*定义主码、外码、和人数、余额的取值范围。*/
 /*创建储蓄所表*/
 create table bank(
     bank_ID int primary key identity(10001,1),/*从10001开始，每次增加1*/
     bank_name nvarchar(20),    /*储蓄所名称，*/
     bank_address nvarchar(40),
     bank_peopleNum int check(bank_peopleNum between 1 and 30),
     bank_city nvarchar(10)
 )

 /*创建账户表*/
 /*帐户（编号，姓名，余额，建立日期，储蓄所编号）*/
 create table account(
     account_id int primary key identity(1,1),
     account_name nvarchar(15),
     account_balance int check(account_balance>= 0 ),
     account_found_date char(8),
     bank_ID int foreign key references bank(bank_id)
 )

 /*创建借贷表*/
 /*借贷（帐户，借贷类型，金额，日期）*/
 create table borrow(
     borrow_id int primary key identity(1,1),
     account_ID int foreign key references account(account_ID),
     type_borrow nvarchar(10),
     money_sum int check(money_sum>=0),
     date_borrow char(8)
 )

插入数据

 --插入bank数据
 insert into bank values('长春南湖路','朝阳区',10,'长春市')
 insert into bank values('西安大路','朝阳区',13,'长春市')
 insert into bank values('幸福二路','南关区',11,'长春市')
 insert into bank values('幸福三路','南关区',12,'长春市')
 insert into bank values('桃林街','城关区',18,'灵宝市')

 --插入account数据
 insert into account values('赵大',10000,20170510,10001)
 insert into account values('钱二',5000,20160120,10001)
 insert into account values('张三',50000,20161120,10001)
 insert into account values('李四',50000,20161120,10005)
 insert into account values('孙五',500000,20161110,10005)

 --插入borrow数据
 insert into borrow values(1,'短期',1000,20170516)
 insert into borrow values(2,'长期',3000,20170416)
 insert into borrow values(3,'长期',200000,20170510)

连接查询

--内连接
select account_name,account_balance,bank_name
from account , bank
where account.bank_ID=bank.bank_id and bank_name='长春南湖路'

--左外连接
select bank.bank_ID,count(account_id)'账户个数',sum(account_balance)'余额总数'
from bank left outer join account on(bank.bank_ID=account.bank_ID)
group by bank.bank_ID

嵌套查询

select account_name,account_balance
from account
where bank_ID in(select bank_ID from bank where bank_name='长春南湖路')

select account_name
from account
where account_balance>(select MAX(account_balance)
from account where account_name='长春南湖路')

select*
from account as A,Bank as B
where A.bank_ID=B.bank_ID and B.bank_city in
(select bank_city
from bank
group by bank_city
having count(bank_ID)=(select min(Nm)
from(select bank_city,count(bank_ID)
from bank
group by bank_city
)as _bank(Cy,Nm)
)
);

select account_id from account
where account_id not in
(select id from( select account_ID from borrow
group by account_ID ) as v(id)--,Nm))

组合查询

select account_id
from account except  (select account_ID from borrow )

创建及使用视图

 create view view1 as
 select account.bank_ID,
 sum(account_balance)'balanceSum'
 from bank,account
 where bank.bank_ID=account.bank_ID
 group by account.bank_ID

 select v1.bank_ID vid
 from(select max(v.balanceSum)as balanceSum from view1 v)
 su,view1 v1
 where v1.balanceSum=su.balanceSum

存储过程

--根据上面基本表的信息定义一个存储过程，完成下面功能：
--入口参数：储蓄所编号
--1 显示储蓄所信息
--2 如果没有帐户，删除该储蓄所记录
--3 如果帐户余额总额低于100万元，开一个新帐户
alter PROCEDURE pr_bank(@bank_id int)
as
BEGIN
    select *from bank
    where bank_ID = @bank_id
    if (select count(*) from account where bank_id=@bank_id)=0
         delete  from bank where bank_ID=@bank_id
    if (select sum(account_balance) from account where bank_id=@bank_id group by bank_id)<1000000
        insert into account(bank_id) values(@bank_id)
END

exec pr_bank 10005

作者：耑新新，发布于  博客园

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